DIFFERENTIAL
IMPEDANCE TRANSDUCERS
In a differential impedance circuit, the coils of a pair of sensors form
the opposite legs of a balanced bridge circuit. This differential configuration
achieves its high resolution by eliminating any intervening summation
and log amplifiers that would normally add noise and drift to the system.
Additionally, by using electrically matched sensors on opposing legs of
the same bridge, temperature effects common to the sensors and cabling
of a differential sensor pair tend to be cancelled. This is true for the
mechanical aspects of the sensor/target system also.
Kaman's KD-5100
and DIT-5200
products use differential impedance circuits for high resolution and low
thermal sensitivity.
(R) Kaman Measuring Systems - All rights reserved, 2008.